Dilithium no longer directly rewarded from STF runs, but still via indirect turn-ins
After a lot of internal deliberate, we made the decision to remove Dilithium as a direct reward from STFs to make it consistent with all current and future Reputation content (for example Romulan Reputation mission do not directly reward Dilithium either). However, STFs still reward Dilithium indirectly via Omega Marks and Borg Neural Processors (Elite only) via projects in the Omega Fleet reputation.

You can engage in as much "internal deliberate" all you want, this is crap, and if you don't know it's crap, you don't deserve the income you're receiving and to be called game designers.